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Maintenance rights intangible and lease premium, net (Movements in maintenance rights intangible) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward]    
Maintenance rights intangible at beginning of period $ 2,117,034  
Maintenance rights intangible at end of period 1,464,599 $ 2,117,034
Maintenance Rights Intangible [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Maintenance rights intangible at beginning of period 2,117,034 3,068,318
EOL and MR contract maintenance rights expense (355,845) (381,637)
MR contract maintenance rights write-off due to maintenance liability release (77,494) (173,971)
EOL contract maintenance rights write-off due to cash receipt (106,433) (96,503)
EOL and MR contract intangible write-off due to sale of aircraft (112,663) (284,411)
Transfer to other assets 0 (17,162)
Additions due to aircraft acquisitions 0 2,400
Maintenance rights intangible at end of period $ 1,464,599 $ 2,117,034